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Ahlefeldt, Thomas and Koop, Lars (2010) A new microphone array for aeroacoustic measurements in a cryogenic environment. Journal of Sound and Vibration, Vol. 329 (22), pp. 4818-4819. Elsevier. doi: 10.1016/j.jsv.2010.06.001.
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Official URL: http://www.elsevier.com
Abstract
Measurement techniques based on microphone-arrays are well-known and common practice on scaled models in wind tunnels with closed test section. Usually, full-scale Reynolds numbers are not achieved. To increase the Reynolds number measurements are performed in cryogenic and/or pressurized wind tunnels. At the DLR Institute of Aerodynamics and Flow Technology the microphone array measurement technique was further developed to perform measurements in a cryogenic wind tunnel at temperatures down to 100 K. In order to use a microphone array in a cryogenic environment, coming to grips with cold hardiness and ensuring long term stability of the array fairing and the electronic devices, especially the microphones, are the primary challenge. In a first step measurements of the radiated noise from a single rod configuration have been conducted in the cryogenic wind tunnel DNW-KKK using a prototype microphone array designed for cryogenic environment. Measurements were carried out with a wide range of operational flow parameters. The measured sound radiation results showed a very good agreement with theory and a Reynolds number dependency of the measured and predicted sound power was shown.
| Item URL in elib: | https://elib.dlr.de/62736/ | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Document Type: | Article | |||||||||
| Title: | A new microphone array for aeroacoustic measurements in a cryogenic environment | |||||||||
| Authors: |
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| Date: | 2010 | |||||||||
| Journal or Publication Title: | Journal of Sound and Vibration | |||||||||
| Refereed publication: | Yes | |||||||||
| Open Access: | No | |||||||||
| Gold Open Access: | No | |||||||||
| In SCOPUS: | Yes | |||||||||
| In ISI Web of Science: | Yes | |||||||||
| Volume: | Vol. 329 | |||||||||
| DOI: | 10.1016/j.jsv.2010.06.001 | |||||||||
| Page Range: | pp. 4818-4819 | |||||||||
| Publisher: | Elsevier | |||||||||
| Series Name: | Aeroacoustic Research in Europe: The CEAS-ASC Report on 2009 Highlights | |||||||||
| Status: | Published | |||||||||
| Keywords: | microphone array measurements, closed test section, cryogenic wind tunnel, airframe noise | |||||||||
| HGF - Research field: | Aeronautics, Space and Transport | |||||||||
| HGF - Program: | Aeronautics | |||||||||
| HGF - Program Themes: | Aircraft Research (old) | |||||||||
| DLR - Research area: | Aeronautics | |||||||||
| DLR - Program: | L AR - Aircraft Research | |||||||||
| DLR - Research theme (Project): | L - Concepts & Integration (old) | |||||||||
| Location: | Göttingen | |||||||||
| Institutes and Institutions: | Institute of Aerodynamics and Flow Technology > Experimental Methods | |||||||||
| Deposited By: | Micknaus, Ilka | |||||||||
| Deposited On: | 04 Oct 2010 09:55 | |||||||||
| Last Modified: | 10 Jan 2019 15:49 |
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